Question

Which of the following HUDs generate image on a phosphor screen?

(a) First generation HUDs

(b) Second generation HUDs

(c) Third generation HUDs

(d) Fourth generation HUDs

This question was addressed to me in an internship interview.

Query is from Cockpit Overview topic in section Cockpit Overview of Aircraft Maintenance

Answer 1

Right answer is (a) First generation HUDs

To explain: The first generation head up displays use a phosphor screen to generate the image. Such screens have a shorter shelf life as the screen coating may degrade with time, making the equipment unusable.